CN112781772B - Online tensiometer system and method - Google Patents
Online tensiometer system and method Download PDFInfo
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- CN112781772B CN112781772B CN202110169378.4A CN202110169378A CN112781772B CN 112781772 B CN112781772 B CN 112781772B CN 202110169378 A CN202110169378 A CN 202110169378A CN 112781772 B CN112781772 B CN 112781772B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/04—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands
- G01L5/10—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands using electrical means
Abstract
The invention discloses an online tensiometer system and a method thereof, which adopts a processor unit and a conditioning circuit, the output voltage signal of the mandrel of the tension sensor is collected by a conditioning circuit, is transmitted to a processor unit after being preprocessed, simultaneously, the output signal of the standard tensiometer is collected and is transmitted to the processor unit after being preprocessed, according to the differential signal of the voltage signal output by the mandrel of the tension sensor, the error caused by the output nonlinearity of the mandrel of the tension sensor and the abrasion of the tension measuring wheel is corrected by taking the output signal of the standard tensiometer as the standard, so that the error caused by the output nonlinearity of the mandrel of the tension sensor and the abrasion of the measuring wheel is corrected, the tension value of the measuring cable is more accurate, the single chip microcomputer is used for controlling automatic completion of the scale of the on-line tension meter, so that the measurement precision and accuracy of the cable tension are improved, and the safety of logging construction is guaranteed.
Description
Technical Field
The invention relates to the technical field of oil field logging, in particular to an online tension meter system and method.
Background
The tensiometer is an essential device in logging construction in petroleum industry, the logging uses the tensiometer to time on the basis of the characteristic of the unbalanced bridge, make platinum wire or stress sheet of the tensiometer into a variable resistance arm of the bridge, when not stressed, the bridge is balanced, there is no output signal, when stressed, the bridge will output the voltage signal which presents the sexual relation with the variable resistance, and then convert into the tension value, can detect fast with the tensiometer; the existing online tensiometer has the following problems in the using process: the original online tensiometer is verified by manually adjusting the potentiometer, and has low output signal precision and large error. ) When the abrasion of the tension measuring wheel is slightly deep, a correct tension signal cannot be output by adjusting a potentiometer, and the logging safety is influenced; when the 13.2mm reinforced cable is used, the tension signal linearity is poor, so that the tension output error is large, and the construction safety cannot be guaranteed.
Disclosure of Invention
The present invention is directed to an online tensiometer system and method for overcoming the deficiencies of the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
an online tensiometer system comprises a processor unit and a conditioning circuit, wherein the input end of the conditioning circuit is connected with a tension sensor mandrel and is used for acquiring a voltage signal output by the tension sensor mandrel, preprocessing the output voltage signal and transmitting the preprocessed output voltage signal to the processor unit; the input end of the conditioning circuit is connected with a standard tensiometer and is used for acquiring an output signal of the standard tensiometer, preprocessing the output signal and transmitting the preprocessed output signal to the processor unit, if a differential signal of a voltage signal output by a mandrel of the preprocessed tension sensor is smaller than 1.2V, the preprocessed differential signal enters a scale state, and the processor unit corrects errors caused by nonlinearity output by the mandrel of the tension sensor and abrasion of a tension measuring wheel by taking the output signal of the standard tensiometer as a standard; and if the difference signal of the output voltage signal of the mandrel of the tension sensor after the pretreatment is greater than or equal to 1.2V, calculating the output voltage signal of the mandrel of the tension sensor by using a fitting formula after the correction to obtain a tension value.
Furthermore, the tension sensor mandrel adopts a CPA-0.5-1 sensor mandrel.
Furthermore, the conditioning circuit comprises a calibration conditioning circuit, a calibration conditioning circuit and a conversion circuit, wherein the calibration conditioning circuit is used for preprocessing the output signal of the tension sensor into a differential signal and sending the differential signal to the processor unit for processing, the calibration conditioning circuit is used for preprocessing the output signal of the standard tension sensor into a differential signal and sending the differential signal to the processor unit for processing, and the conversion circuit is used for increasing the output negative end signal of the calibration conditioning circuit and the calibration conditioning circuit.
Further, the calibration and conditioning circuit includes a resistor R25, a resistor R26, a resistor R29, a resistor R30, a capacitor C30 and an operational amplifier U30, one end of the resistor R30 is connected to one end of the variable resistor POT, the other end of the resistor R30 is connected to one end of the resistor R30 and then is a connection point P30, the other end of the resistor R30 is connected to one end of the capacitor C30 and a non-inverting input end of the operational amplifier U30, the non-inverting input end and the inverting input end of the operational amplifier U30 are connected to the resistor R30, the other end of the capacitor C30 is connected to the inverting input end of the operational amplifier U30 and one end of the resistor R30, the other end of the resistor R30 is a connection point P30, a positive power supply and a negative power supply of the operational amplifier U30 are respectively connected in parallel to the capacitor C30 and the capacitor C30, the operational amplifier U30 is connected to a 15V power supply, the other end of the capacitor C30 and the other end of the resistor C30 is connected to the ground, the other end of the resistor R30 is connected to one end of the capacitor C23 and serves as a positive output TEN1+, and the other end of the capacitor C23 is grounded.
Furthermore, the calibration conditioning circuit comprises a resistor R27, a resistor R21, a resistor R24, a resistor R6, a resistor R33, a capacitor C33 and a capacitor C43, the circuit comprises a capacitor C35, a capacitor C20, a capacitor C38, a zener diode D3 and an operational amplifier U6, wherein one end of a resistor R27 is a connection point P11, the other end of a resistor R27 is connected with the negative electrode of the zener diode D3 and one end of a resistor R21, the positive electrode of the zener diode D3 is grounded, the other end of the resistor R21 is connected with one end of a resistor R24, one end of the capacitor C33 and the non-inverting input end of the operational amplifier U6, the other end of the resistor R24 and the other end of the capacitor C33 are grounded and the inverting input end of the operational amplifier U6, the output end of the operational amplifier U6 is connected with one end of a capacitor C20 to serve as a positive-phase output, the other end of the capacitor C20 is grounded, the zeroing end of the operational amplifier U6 is connected with one end of a resistor R33, and the other end of a resistor R33 is connected with one end of a resistor C38 to serve as a negative-phase output.
Further, the conversion circuit comprises an operational amplifier U1A, wherein the output end of the operational amplifier U1A is connected with one end of a resistor R32 and one end of a resistor R33, the other end of a resistor R32 is connected with one end of a capacitor C37, and the other end of the capacitor C37 is grounded; the inverting input terminal of the operational amplifier U1A is connected to one terminal of the resistor R32, and the non-inverting input terminal of the operational amplifier U1A is connected to the processor unit.
Further, the processor unit is connected with an output buffer amplifying circuit, the output buffer amplifying circuit comprises an operational amplifier U1B, a resistor R2, a resistor R4, a resistor R5, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R23, a capacitor C18 and a capacitor C19, an inverting input end of the operational amplifier U1B is connected with one end of the resistor R2 and one end of the resistor R4, the other end of the resistor R4 is connected with an output end of the conversion circuit, the other end of the resistor R2 is connected with an output end of the operational amplifier U1B, a same-direction input end of the operational amplifier U1B is connected with one end of the resistor R10 and one end of the resistor R7, the other end of the resistor R7 is connected with one end of the capacitor C19 and one end of the resistor R23, the other end of the resistor R23 is connected with a DAC output end of the processor unit, and the other end of the capacitor C19 is grounded; the output end of the operational amplifier U1B is connected with one end of a resistor R8 and one end of a resistor R5, the other end of the resistor R5 is an anode output end SIG-OUT + P7, the other end of the resistor R8 is connected with one end of a capacitor C18, the anode of a voltage stabilizing diode D4 and the cathode of the voltage stabilizing diode D5, the anode of the voltage stabilizing diode D5 is grounded, the cathode of the voltage stabilizing diode D4 is connected with a power supply, the other end of the capacitor C18 is grounded, one end of a resistor R9 is grounded, and the other end of the resistor R9 is a cathode output end SIG-OUT-P6.
Furthermore, the processor unit adopts an ADUC7060 singlechip.
An online tension meter force measuring method includes the steps that differential signals of the output end of a tension sensor mandrel are collected in real time, when the differential signals of the output end of the tension sensor mandrel are smaller than 1.2V, standard tension meter output signals are used as standards, one point of data is sampled at intervals of 500 pounds when pressure is applied, a tension value output by the standard tension meter and a voltage value output by the tension sensor mandrel are recorded simultaneously when each point is collected, and the sampling data are used for realizing correction of errors caused by nonlinearity of the output of the tension meter mandrel and abrasion of a tension measuring wheel through a mode of combining least square fitting and three-point parabolic fitting to form a corrected fitting formula; and when the differential signal of the output end of the mandrel of the tension sensor is greater than 1.2V, calculating a tension value by using the corrected fitting formula, thereby realizing the force measurement of the online tensiometer.
Further, the maximum sampling pull force at the time of sampling was 9000 pounds.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention relates to an online tension meter system, which adopts a processor unit and a conditioning circuit, collects voltage signals output by a mandrel of a tension sensor through the conditioning circuit, preprocesses the voltage signals and transmits the voltage signals to the processor unit, collects output signals of a standard tension meter, preprocesses the output signals and transmits the preprocessed output signals to the processor unit, corrects errors caused by the nonlinearity output by the mandrel of the tension sensor and the abrasion of a tension measuring wheel by taking the output signals of the standard tension meter as a standard according to differential signals of the voltage signals output by the mandrel of the tension sensor, realizes the correction of the errors caused by the nonlinearity output by the mandrel of the tension sensor and the abrasion of the measuring wheel, and has more accurate tension value of a measuring cable.
Furthermore, a special sensor weak signal processing chip with low signal noise is adopted for receiving signals, so that the acquisition precision is improved, and the influence of interference signals on the measurement result is reduced. The A/D conversion accuracy is improved by raising the negative terminal signal voltage.
Furthermore, the signal driving capability is enhanced, the clamping and protection effects on the tension signal input to the tension signal processing panel are achieved, and the tension signal processing panel is prevented from being damaged due to the fact that the signal amplitude is too large.
The invention relates to an online tension meter force measuring method, which realizes correction of errors caused by nonlinearity of output of a tension meter mandrel and abrasion of a tension measuring wheel by using collected data through a mode of combining least square fitting and three-point parabolic fitting, simultaneously stores fitting parameters into a data memory, calculates a tension value by using a fitting formula calculated in a scale state, automatically finishes the scale of an online tension meter through single chip microcomputer control, improves the measurement precision and accuracy of cable tension and ensures the safety of logging construction.
Drawings
Fig. 1 is a system block diagram in an embodiment of the invention.
FIG. 2 is a diagram of a conditioning circuit in an embodiment of the invention.
FIG. 3 is a diagram of an output buffer amplifier circuit according to an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
the invention discloses an intelligent online tensiometer system, which is an interface circuit mainly comprising a processor unit, and provides an interface circuit board suitable for weak signal acquisition and processing aiming at the problem of nonlinearity of output voltage of a mandrel of a tension sensor and pulling force exerted on the mandrel.
As shown in fig. 1, an online tensiometer system includes a processor unit and a conditioning circuit, wherein an input end of the conditioning circuit is connected to a tension sensor mandrel and is used for acquiring an output voltage signal of the tension sensor mandrel, preprocessing the output voltage signal and transmitting the preprocessed output voltage signal to the processor unit; the input end of the conditioning circuit is connected with a standard tensiometer and is used for acquiring an output signal of the standard tensiometer, preprocessing the output signal and transmitting the preprocessed output signal to the processor unit, if a differential signal of a voltage signal output by a spindle of the preprocessed tension sensor is smaller than 1.2V, the preprocessed output signal enters a scale state, and the processor unit corrects errors caused by nonlinearity output by the spindle of the tension sensor and abrasion of a tension measuring wheel by taking the output signal of the standard tensiometer as a standard; and if the difference signal of the output voltage signal of the mandrel of the tension sensor after pretreatment is more than or equal to 1.2V, entering a logging state, and calculating a tension value by fitting the output voltage signal of the mandrel of the tension sensor.
The tension sensor mandrel adopts a CPA-0.5-1 sensor mandrel.
As shown in fig. 2, the conditioning circuit amplifies and filters the weak signal output by the tension sensor through the weak signal acquisition chip of the sensor, and then sends the amplified and filtered weak signal to the processor unit for processing.
The conditioning circuit comprises a calibration conditioning circuit, a check conditioning circuit and a conversion circuit, the check conditioning circuit comprises a resistor R25, a resistor R26, a resistor R29, a resistor R30, a resistor R34, a capacitor C21, a capacitor C23, a capacitor C17, a capacitor C24 and an operational amplifier U5, one end of the resistor R5 is connected with one end of a variable resistor POT, the other end of the resistor R5 is connected with one end of the resistor R5 and then is a connection point P5, the other end of the resistor R5 is connected with one end of the capacitor C5 and a non-inverting input end of the operational amplifier U5, the non-inverting input end and the inverting input end of the operational amplifier U5 are connected with the resistor R5, the other end of the capacitor C5 is connected with the inverting input end of the operational amplifier U5 and one end of the resistor R5, the other end of the resistor R5 is a connection point P5, a power supply positive pole and a power supply negative pole of the operational amplifier U5 are respectively connected with the capacitor C5 and the ground, the output end of the operational amplifier U5 is connected with one end of a resistor R30, the other end of the resistor R30 is connected with one end of a capacitor C23 and then used as a positive output TEN1+, and the other end of the capacitor C23 is grounded; output signals SIG + and SIG-of the tension sensor are respectively input to a positive end and a negative end of an operational amplifier U5 through a connection point P2 and a connection point P1, amplified by the operational amplifier U5 (the amplification factor of the application is 86.9 times), output and filtered by a resistor R30 and a capacitor C23; meanwhile, the processor unit sends out a 800uA current source to be converted into a 544mv voltage signal, the negative terminal signal is raised and output to 544mv, and then the negative terminal signal and the positive terminal output signal are used as a differential signal to be sent to the processor unit for processing;
the calibration conditioning circuit comprises a resistor R27, a resistor R21, a resistor R24, a resistor R6, a resistor R33, a capacitor C33, a capacitor C43, a capacitor C35, a capacitor C20, a capacitor C38, a voltage stabilizing diode D3 and an operational amplifier U6, one end of a resistor R27 is a connection point P11, the other end of the resistor R27 is connected with the negative electrode of a voltage stabilizing diode D3 and one end of a resistor R21, the positive electrode of a voltage stabilizing diode D3 is grounded, the other end of the resistor R21 is connected with one end of a resistor R24, one end of a capacitor C33 and the non-inverting input end of an operational amplifier U6, the other end of a resistor R24 and the other end of a capacitor C33 are grounded, the inverting input end of the operational amplifier U6 is connected with the other end of the capacitor C6, the output end of the operational amplifier U6 is connected with one end of a capacitor C20 and then serves as a positive phase output TURE-TEN +, the other end of the capacitor C20 is grounded, the zeroing end of the operational amplifier U6 is connected with one end of the resistor R33, and the other end of the resistor R33 is connected with one end of the resistor C38 and then serves as a negative phase output TURE-TEN-;
the conversion circuit comprises an operational amplifier U1A, wherein the output end of the operational amplifier U1A is connected with one end of a resistor R32 and one end of a resistor R33, the other end of a resistor R32 is connected with one end of a capacitor C37, and the other end of the capacitor C37 is grounded; the inverting input terminal of the operational amplifier U1A is connected to one terminal of the resistor R32, and the non-inverting input terminal of the operational amplifier U1A is connected to the processor unit.
The processor unit outputs a 800uA current source which is converted into a 544mv voltage signal, the calibration and conditioning circuit is raised to output a negative terminal signal to 544mv, and then the signal and a positive terminal output signal of the calibration and conditioning circuit are used as a differential signal to be sent to the processor unit; the output signal of the standard tension sensor is input into an operational amplifier U6 through a connection point P11, the output is filtered by a resistor R6 and a capacitor C20 after passing through an operational amplifier U6, a current source of 800uA is output by the processor unit and converted into a voltage signal of 544mv, the negative end of the calibration conditioning circuit is raised and output to 544mv, and then the voltage signal and the output signal of the positive end of the calibration conditioning circuit are used as a differential signal to be sent to the processor unit. By adopting the conditioning circuit, the invention can effectively reduce the signal noise, improve the acquisition precision and reduce the influence of interference signals on the measurement result; the A/D conversion accuracy is improved by raising the negative terminal signal voltage.
The processor unit is connected with an output buffer amplifying circuit, the output buffer amplifying circuit comprises an operational amplifier U1B, a resistor R2, a resistor R4, a resistor R5, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R23, a capacitor C18 and a capacitor C19, an inverting input end of the operational amplifier U1B is connected with one ends of the resistor R2 and the resistor R4, the other end of the resistor R4 is connected with an output end of the conversion circuit, the other end of the resistor R2 is connected with an output end of the operational amplifier U1B, a same-direction input end of the operational amplifier U1B is connected with one ends of the resistor R10 and the resistor R7, the other end of the resistor R7 is connected with one end of the capacitor C19 and one end of the resistor R23, the other end of the resistor R23 is connected with a DAC output end of the processor unit, and the other end of the capacitor C19 is grounded; the output end of the operational amplifier U1B is connected with one end of a resistor R8 and one end of a resistor R5, the other end of the resistor R5 is an anode output end SIG-OUT + P7, the other end of the resistor R8 is connected with one end of a capacitor C18, the anode of a voltage stabilizing diode D4 and the cathode of the voltage stabilizing diode D5, the anode of the voltage stabilizing diode D5 is grounded, the cathode of the voltage stabilizing diode D4 is connected with a power supply, the other end of the capacitor C18 is grounded, one end of a resistor R9 is grounded, and the other end of the resistor R9 is a cathode output end SIG-OUT-P6. The output buffer amplifying circuit filters and amplifies the analog tension signal output by the processor unit, enhances the driving capability, and sends the signal to the tension signal processing panel for display.
Analog tension signals output after being processed by the processor unit are filtered by a resistor R23 and a capacitor C19 and then input to the homodromous input end of an operational amplifier U1B, 544mv of signals at the reverse input end of the operational amplifier U1B is raised to eliminate 544mv of voltage raised by the conditioning circuit, and the signals are amplified by an operational amplifier U1B and then sent to a tension signal processing panel through a positive output end P7 and a negative output end P6. D4 plays the role of clamping and protection. The signal driving capability is enhanced through the output buffer amplifying circuit, the tension signal input to the tension signal processing panel is clamped and protected, and the tension signal processing panel is prevented from being damaged due to overlarge signal amplitude.
As shown in fig. 1, the processor unit of the present invention employs an ADUC7060 single chip microcomputer, and the ADUC7060 single chip microcomputer includes a program processor, a data processor, an a/D converter, and a D/a converter. The A/D converter of the ADUC7060 single chip microcomputer consists of two differential pairs or four main ADCs of single-ended channels and 7 built-in auxiliary ADCs of the channels.
The invention collects the output signal of the on-line tensiometer by using ADC0 and ADC1 of the main ADC channel, and collects the output signal of the standard tensiometer by using ADC2 and ADC3 of the auxiliary ADC channel.
The ADUC7060 single chip microcomputer judges whether the single chip microcomputer is in a logging state or a calibration state by sampling differential signals at two ends of ADC0 and ADC1, when the differential signals at two ends of ADC0 and ADC1 are smaller than 1.2V, the single chip microcomputer enters the calibration state, the calibration principle is that the output signal of a standard tensiometer is taken as a standard, when pressure is applied, one point data is sampled at an interval of 500 pounds, when each point is collected, the tension value output by the standard tensiometer and the voltage value output by a CPA tensiometer mandrel are recorded at the same time, 38 data of 19 points are sampled, the highest sampling tension is 9000 pounds, and the sampled data of 19 points are stored in a data memory; the correction of the errors caused by the nonlinearity of the mandrel output of the CPA-0.5-1 tensiometer and the abrasion of a tension measuring wheel is realized by using the sampling data of 19 points through a mode of combining least square fitting and parabolic fitting of three points, and meanwhile, the fitting parameters are stored in a data memory; when the differential signals at the two ends of the ADC0 and the ADC1 are larger than 1.2V, the logging state is started, after CPA tensiometer mandrel output signals enter a single chip microcomputer, a tension value is calculated by using a fitting formula calculated in a calibration state, then the tension value is converted into analog signals through a DAC0 port of a 16-bit D/A converter, the analog signals are output to an output buffer amplifier, and then the analog signals are sent to a winch panel for display.
Claims (6)
1. An online tensiometer system is characterized by comprising a processor unit and a conditioning circuit, wherein the input end of the conditioning circuit is connected with a tension sensor mandrel and is used for acquiring an output voltage signal of the tension sensor mandrel, preprocessing the output voltage signal and transmitting the preprocessed output voltage signal to the processor unit; the input end of the conditioning circuit is connected with a standard tensiometer and is used for acquiring an output signal of the standard tensiometer, preprocessing the output signal and transmitting the preprocessed output signal to the processor unit, if a differential signal of a voltage signal output by a spindle of the preprocessed tension sensor is smaller than 1.2V, the preprocessed output signal enters a scale state, and the processor unit corrects errors caused by nonlinearity output by the spindle of the tension sensor and abrasion of a tension measuring wheel by taking the output signal of the standard tensiometer as a standard; if the difference signal of the output voltage signal of the mandrel of the tension sensor after pretreatment is more than or equal to 1.2V, calculating the output voltage signal of the mandrel of the tension sensor by using a fitting formula after correction to obtain a tension value;
the conditioning circuit comprises a calibration conditioning circuit, a calibration conditioning circuit and a conversion circuit, wherein the calibration conditioning circuit is used for preprocessing the output signal of the tension sensor into a differential signal and sending the differential signal to the processor unit for processing, the calibration conditioning circuit is used for preprocessing the output signal of the standard tension sensor into the differential signal and sending the differential signal to the processor unit for processing, and the conversion circuit is used for heightening the output negative end signal of the calibration conditioning circuit and the calibration conditioning circuit;
the checking and conditioning circuit comprises a resistor R25, a resistor R26, a resistor R29, a resistor R30, a capacitor C30 and an operational amplifier U30, wherein one end of the resistor R30 is connected with one end of a variable resistor POT, the other end of the resistor R30 is connected with one end of the resistor R30 to form a connection point P30, the other end of the resistor R30 is connected with one end of the capacitor C30 and a non-inverting input end of the operational amplifier U30, the non-inverting input end and the inverting input end of the operational amplifier U30 are connected with the resistor R30, the other end of the capacitor C30 is connected with the inverting input end of the operational amplifier U30 and one end of the resistor R30, the other end of the resistor R30 is connected with the connection point P30, the positive power supply and the negative power supply of the operational amplifier U30 are respectively connected with the capacitor C30 and the capacitor C30 in parallel, the operational amplifier U30 is connected with a 15V power supply, the other end of the capacitor C30 and the other end of the capacitor C30 is connected with the ground, one end of the operational amplifier U30 is connected with the output end of the operational amplifier U30, the other end of the resistor R30 is connected with one end of the capacitor C23 and then used as a positive electrode output TEN1+, and the other end of the capacitor C23 is grounded;
the calibration conditioning circuit comprises a resistor R27, a resistor R21, a resistor R24, a resistor R6, a resistor R33, a capacitor C33, a capacitor C43, a capacitor C35, a capacitor C20, a capacitor C38, a zener diode D3 and an operational amplifier U6, wherein one end of the resistor R27 is a connection point P11, the other end of the resistor R27 is connected with the negative electrode of the zener diode D3 and one end of the resistor R21, the positive electrode of the zener diode D3 is grounded, the other end of the resistor R21 is connected with one end of a resistor R24, one end of the capacitor C33 and the non-inverting input end of the operational amplifier U6, the other end of the resistor R24 and the other end of the capacitor C33 are grounded with the inverting input end of the operational amplifier U6, the output end of the operational amplifier U6 is connected with one end of the capacitor C20 to serve as a positive phase output, the other end of the capacitor C20 is grounded, the zeroing end of the operational amplifier U6 is connected with one end of the resistor R33 and the other end of the resistor R33 is connected with the negative phase output of the operational amplifier U38;
the conversion circuit comprises an operational amplifier U1A, wherein the output end of the operational amplifier U1A is connected with one end of a resistor R32 and one end of a resistor R33, the other end of a resistor R32 is connected with one end of a capacitor C37, and the other end of the capacitor C37 is grounded; the inverting input terminal of the operational amplifier U1A is connected to one terminal of the resistor R32, and the non-inverting input terminal of the operational amplifier U1A is connected to the processor unit.
2. An in-line tensiometer system as claimed in claim 1 wherein the tension sensor mandrel is a CPA-0.5-1 sensor mandrel.
3. An in-line tensiometer system according to claim 1, characterised in that the processor unit is connected to an output buffer amplifier circuit comprising an operational amplifier U1B, a resistor R2, a resistor R4, a resistor R5, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R23, a capacitor C18 and a capacitor C19, the inverting input of the operational amplifier U1B is connected to one end of the resistor R2 and the resistor R4, the other end of the resistor R4 is connected to the output of the switching circuit, the other end of the resistor R2 is connected to the output of the operational amplifier U1B, the non-inverting input of the operational amplifier U1B is connected to one end of the resistor R10 and the resistor R7, the other end of the resistor R7 is connected to one end of the capacitor C19 and one end of the resistor R23, the other end of the resistor R23 is connected to the DAC output of the processor unit, and the other end of the capacitor C19 is grounded; the output end of the operational amplifier U1B is connected with one end of a resistor R8 and one end of a resistor R5, the other end of the resistor R5 is an anode output end SIG-OUT + P7, the other end of the resistor R8 is connected with one end of a capacitor C18, the anode of a voltage stabilizing diode D4 and the cathode of the voltage stabilizing diode D5, the anode of the voltage stabilizing diode D5 is grounded, the cathode of the voltage stabilizing diode D4 is connected with a power supply, the other end of the capacitor C18 is grounded, one end of a resistor R9 is grounded, and the other end of the resistor R9 is a cathode output end SIG-OUT-P6.
4. The in-line tensiometer system according to claim 1, wherein the processor unit is an ADUC7060 single chip microcomputer.
5. An online tensiometer force measuring method based on the online tensiometer system of claim 1 is characterized in that a differential signal at the output end of a mandrel of a tension sensor is collected in real time, when the differential signal at the output end of the mandrel of the tension sensor is smaller than 1.2V, a signal output by a standard tensiometer is taken as a standard, one point of data is sampled at an interval of 500 pounds when pressure is applied, a tension value output by the standard tensiometer and a voltage value output by the mandrel of the tension sensor are simultaneously recorded when each point is collected, and the correction of the error caused by the nonlinearity of the mandrel output of the tension meter and the abrasion of a tension measuring wheel is realized by using the sampled data through a mode of combining least square fitting and three-point parabolic fitting to form a corrected fitting formula; and when the differential signal of the output end of the mandrel of the tension sensor is greater than 1.2V, calculating a tension value by using the corrected fitting formula, thereby realizing the force measurement of the online tensiometer.
6. The method of claim 5 wherein the highest sample pull force at the time of sampling is 9000 pounds.
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